Games won primarily by achieving a line, connection or configuration of pieces, another Parlett family, covering Connect Four, Dots and Boxes, Gomoku, Hex, Nine Men's Morris and Tic-tac-toe, plus Nim, a purely mathematical combinatorial game placed here as the tree's closest available neighbor rather than left as a singleton. Belongs here: abstract games of alignment, connection or combinatorial calculation with no element of chance. Does not belong here: territorial-control games, grouped under Space and Territory Games, or piece-capture games, grouped under Displacement and Capture Games.